This is the default-xhdpi theme, and this is better but preferably would still like it to be bigger, or at least the buttons.
I’ve looked through the theme files to see what exactly makes these themes different, and it looks like the image sizes. The “close.png” (not original file name) in Arc Dark, is 28x28px, whereas the “close.png” file in default-xhdpi is something like 43x58px (apart from it also being a different file type which I don’t believe affects it, unless it’s because it’s an SVG-type thing as mentioned in the README).
So correct me if I’m wrong, the one way to make the buttons bigger on Arc Dark (other than changing the resolution, which I’ve done and there’s barely a difference), is to either use another HDPI theme which I haven’t found many… or create bigger image dimensions for that theme, which should increase the buttons.
@joekamprad Thank you for sending me that doc, I have a feeling that MD file is slightly out of date, or perhaps, the more likely option, I’m in the wrong place. I’ve gone to /usr/share/themes/Arc/xfwm4 it mentions about having a directory for light and dark, however all I have is a lot of .pngs plus themerc.
I’ll do some further research or wait for 4.16 to come out as it’s around November time I believe.